補(bu)償(chang)(chang)器(qi)習慣(guan)上也叫膨脹節(jie)，或伸(shen)縮節(jie)。由(you)構成(cheng)其(qi)工(gong)作主(zhu)體(ti)的(de)波紋管(guan)(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性元件(jian)）和(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支架、法(fa)蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)(deng)附件(jian)組成(cheng)。 屬于一種(zhong)補(bu)償(chang)(chang)元件(jian)。利(li)用(yong)其(qi)工(gong)作主(zhu)體(ti)波紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)有(you)效伸(shen)縮變(bian)形(xing)，以吸收(shou)管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)(deng)由(you)熱(re)脹冷縮等(deng)(deng)原因(yin)而(er)產生的(de)尺寸變(bian)化，或補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)(deng)的(de)軸向(xiang)、橫向(xiang)和(he)角(jiao)向(xiang)位移(yi)。也可用(yong)于降噪(zao)減振(zhen)。在(zai)現(xian)代工(gong)業中用(yong)途廣泛。供熱(re)上，為了防(fang)止供熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)道升溫(wen)時，由(you)于熱(re)伸(shen)長或溫(wen)度(du)應力而(er)引(yin)起管(guan)(guan)(guan)(guan)(guan)(guan)道變(bian)形(xing)或破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道上設置補(bu)償(chang)(chang)器(qi)，以補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道的(de)熱(re)伸(shen)長，從而(er)減小管(guan)(guan)(guan)(guan)(guan)(guan)壁(bi)的(de)應力和(he)作用(yong)在(zai)閥件(jian)或支架結構上的(de)作用(yong)力。